GD32F103PWM最高分辨率

只看该作者 · 2019-6-20 09:35

GD32F103PWM的最高分辨率是多少？
目前我测试情况是（1/4）*108=27M，大约为37ns。不论我把Timer0的分频设置为TIMER_CKDIV_DIV1或者是设置为TIMER_CKDIV_DIV4，结果都是一样的，代码如下：
void PWM0_Configuration(void)
{
timer_oc_parameter_struct timer_ocintpara;
timer_parameter_struct timer_initpara;
timer_break_parameter_struct timer_breakpara;

rcu_periph_clock_enable(RCU_TIMER0);

timer_deinit(TIMER0);

/* TIMER0 configuration */
timer_initpara.prescaler       = 0;  //
timer_initpara.alignedmode    = TIMER_COUNTER_EDGE;
timer_initpara.counterdirection  = TIMER_COUNTER_UP;
timer_initpara.period          = 349;
timer_initpara.clockdivision    = TIMER_CKDIV_DIV1;
timer_initpara.repetitioncounter = 0;
timer_init(TIMER0,&timer_initpara);

/* CH0/CH0N configuration in PWM mode0 */
timer_ocintpara.outputstate  = TIMER_CCX_ENABLE;
timer_ocintpara.outputnstate = TIMER_CCXN_ENABLE;
timer_ocintpara.ocpolarity = TIMER_OC_POLARITY_HIGH;
timer_ocintpara.ocnpolarity  = TIMER_OCN_POLARITY_HIGH;
timer_ocintpara.ocidlestate  = TIMER_OC_IDLE_STATE_LOW;
timer_ocintpara.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW;

timer_channel_output_config(TIMER0,TIMER_CH_0,&timer_ocintpara);

timer_channel_output_pulse_value_config(TIMER0,TIMER_CH_0,175);
timer_channel_output_mode_config(TIMER0,TIMER_CH_0,TIMER_OC_MODE_PWM0);
timer_channel_output_shadow_config(TIMER0,TIMER_CH_0,TIMER_OC_SHADOW_DISABLE);

/* automatic output enable, break, dead time and lock configuration*/
timer_breakpara.runoffstate    = TIMER_ROS_STATE_DISABLE;
timer_breakpara.ideloffstate    = TIMER_IOS_STATE_DISABLE ;
timer_breakpara.deadtime       = 10;
timer_breakpara.breakpolarity = TIMER_BREAK_POLARITY_LOW;
timer_breakpara.outputautostate  = TIMER_OUTAUTO_ENABLE;
timer_breakpara.protectmode    = TIMER_CCHP_PROT_OFF;
timer_breakpara.breakstate    = TIMER_BREAK_ENABLE;
timer_break_config(TIMER0,&timer_breakpara);

/* TIMER0 primary output function enable */
timer_primary_output_config(TIMER0,ENABLE);
timer_auto_reload_shadow_enable(TIMER0);
timer_enable(TIMER0);
}